Hi. Before, when I turned the AC on, the air would blow out of the dash vents. Then it stopped blowing out of the dash and only came out of the defrost. Normal 'Vent' setting or heat would blow out of the dash but not the AC. On investigation there is a vacuum driven flap in the blower box and when you turn on the AC it moves the flap to direct air to the dash vents. Without a vacuum it defaults to the defrost windshield vents. The break in the tube removed the vacuum. Hope that answers the question.
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